<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>JS分片上传-极速上传</title>
</head>
<body>
<input type="file" name="slice" id="slice" >

<div id="output"><!--  信息存放地  --> </div>
<br/>
</body>
<script type="text/javascript" src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.js"></script>


<script type="text/javascript">
    $("#slice").change(function(event) {
        var file = $("#slice")[0].files[0];
        var name = file.name;
        //进行初始化
        $.ajax({
            type:"POST", //请求方式
            url:"http://localhost:8080/getuploadId",
            async: false,
            dataType:"json", //返回数据类型
            data:{//请求参数
                fileName:name,
            },
            success:function(data){ //请求成功后
                console.log("data.code="+JSON.stringify(data));
                console.log("data.data.objectName="+data.data.objectName);
                console.log("data.data.uploadId="+data.data.uploadId);
                var objectName=data.data.objectName;
                var uploadId=data.data.uploadId;
                //成功后执行分段上传
                PostFile(file,0,objectName,uploadId);
                //合并
                combineFile(objectName,uploadId);
            },
            error:function (){
                alert("系统出现异常！");
                flag=false;
            }
        });


    });
    //执行分片上传
    function PostFile(file,i,objectName,uploadId){
        var name = file.name,                           //文件名
            size = file.size,                           //总大小shardSize = 2 * 1024 * 1024,
            shardSize = 1 * 1024 * 1024,                //以2MB为一个分片,每个分片的大小
            shardCount = Math.ceil(size / shardSize);   //总片数
        if(i >= shardCount){
            return;
        }
        //console.log(size,i+1,shardSize);  //文件总大小，第一次，分片大小//
        var start = i * shardSize;
        var end = start + shardSize;
        var packet = file.slice(start, end);  //将文件进行切片
        // 分段号
        var partNumber = i + 1;
        /*  构建form表单进行提交  */
        var form = new FormData();
        form.append("fileId", '001')
        form.append("data", packet); //slice方法用于切出文件的一部分
//         form.append("lastModified", file.lastModified); //最后的额修改时间
        form.append("name", name);
        form.append("totalSize", size);

        form.append("uploadId", uploadId);
        form.append("objectName", objectName);
        form.append("mainFile", packet);
        form.append("total", shardCount);
        form.append("sortNumber", partNumber);

        //uploadId:uploadId,
        //objectName:objectName,
        //mainFile:blob,
        //total:partCount,
        //sortNumber:partNumber

        if(shardCount === i+1){
            shardSize = size - i * shardSize
        }
        form.append("shardSize", shardSize);
        form.append("total", shardCount); //总片数
        form.append("index", i + 1); //当前是第几片
        $.ajax({
            //  header: {
            //      web_token: "cpBvqWrr0UK9zPJoKj+412alxxcY6qFwrSVoO0juZg0S1jX/sGfMd9oi3AsSxW+MdWFrwtGCykUTmMqrqpbCElmT75DfB87lENC7lCuMxgF0d5wQB6yAubUVyGOzhbrScvIfD8ZSjOJ3D88AOy2xRd4oG8TxeGoMoZqnqIwjKg="
            //  },
            url: "http://localhost:8080/multipartupload",
            type: "POST",
            data: form,
            //timeout:"10000",  //超时10秒
            async: false, //同步
            dataType:"json",
            processData: false, //很重要，告诉jquery不要对form进行处理
            contentType: false, //很重要，指定为false才能形成正确的Content-Type
            success: function (data) {
                console.log("data="+JSON.stringify(data));
                /*  表示上一块文件上传成功，继续下一次  */
                if (data.data.code == 1) {
                    form = '';
                    i++;
                    PostFile(file, i,objectName,uploadId);
                } else if (data.data.code == 502) {
                    form = '';
                    /*  失败后，每2秒继续传一次分片文件  */
                    setInterval(function () { PostFile(file, i,objectName,uploadId) }, 2000);
                } else if (data.data.code == 200) {
                    console.log("上传成功");
                } else if (data.data.code == 500) {
                    console.log('第'+msg.i+'次，上传文件有误！');
                } else {
                    console.log('未知错误');
                }
            }
        })
    }


    //合并
    function combineFile(objectName,uploadId){
        console.log("objectName="+objectName);
        console.log("uploadId="+uploadId);
        var object=new Object();
        object.objectName=objectName;
        object.uploadId=uploadId;
        $.ajax({

            headers: {
                Accept: "application/json; charset=utf-8"
            },
            type:"POST", //请求方式
            url:"http://localhost:8080/combine",
            async: false,
            contentType:"application/json",
            dataType:"json", //返回数据类型
            data:JSON.stringify(object),
            success:function(data){ //请求成功后
                console.log("data="+JSON.stringify(data));
                console.log("data.data.code="+data.data.code);
                console.log("data.data.url="+data.data.url);
            },
            error:function (){
                alert("系统出现异常！");
                flag=false;
            }
        });


    }

</script>
</html>
